I had the exact same thing happen to my 94 Spirit.
Driving down the hwy radio went off then later the same day the guages started messing up. If I have the heater motor on high the speedometer stops working etc. The radio never did come back on. Turn the heater off and all is fine. I replaced the battery - the cables -- had the alternator checked etc. Finally gave up - curious to find out what it may be.
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Tuesday, August 12th, 2008 AT 11:24 PM